<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            border: 1px solid #000;
        }
    </style>
</head>

<body>
    <div></div>
    <button>停止</button>
    <script>
        var btn = document.querySelector('button')
        var div = document.querySelector('div')
        var timer = setTimeout(function() {
            div.style.display = 'none'
        }, 5000)
        btn.onclick = function() {
            clearTimeout(timer)
        }
    </script>
</body>

</html>